From CNN:
Many a visitor to New York’s Museum of Modern Art has probably thought, “I could do that.”
A British graffiti artist who goes by the name “Banksy” went one step further, by smuggling in his own picture of a soup can and hanging it on a wall, where it stayed for more than three days earlier this month before anybody noticed.
The prank was part of a coordinated plan to infiltrate four of New York’s top museums on a single day.
More here.